8000 pounds. Don't over think it- keep in mind the WDH makes it easier on your truck to tow; especially when approaching its max. However it does not change how much you can tow.
Yes, look at wet weights. If not available, take dry weight, add the weight of water (US gallon weighs 8.3 pounds), and then add another 1500 pounds. 500 for what the trailer weighs with anything else the manufacturer or dealer installed, and 1000 for your own stuff.
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